The top of the milling line looks good but the bottom looks torn apart ->
The cutter is not going in a perfect circle, bent/broken
End switch activated in z=0 direction
Some tools have an inherent offset in their travel height, ensure the travel height + plate and underlay play thickness + offset < 5mm, this is resolved by following the height settings in the 1 layer guide.
Algorithm contour routing did not produce any toolpaths.